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Reassembly
311882T 17
Reassembly
To reassemble the pump lower and air motor, reverse
the steps on the preceding pages. Follow the torque
requirements listed in the Parts - Model 295616 draw-
ing on page 18.
Troubleshooting
NOTE: See Air Motor Repair, step 3 and step 4
(F
IG
. 12) for special notes on reassembly.
Problem Cause Solution
The pump fails to operate Dirty or worn air motor. Clean, service
Inadequate air supply or restricted
lines.
Clean lines or increase the air supply
(see Technical Data).
Closed or clogged air valves. Open or clear the valves.
Clogged fluid hose or valve. Clear the hose or valves
Worn or damaged valves or seals. Service the valves or seals.
The pump operates, but the output is
low on both strokes.
Clogged fluid hose or valve. Clear the hose or valves.
Exhausted fluid supply. Refill the fluid supply and reprime the
pump.
Worn or damaged valves or seals. Service the valves or seals.
The pump operates, but the output is
low on the downstroke.
Held open or worn intake valve. Clear or service the valve.
Worn or damaged valves or seals. Service the valves or seals.
The pump operates, but the output is
low on the upstroke.
Held open or worn piston valve. Clear or service the valve.
Worn or damaged valves or seals. Service the valves or seals.
Erratic or accelerated operation. Exhausted fluid supply. Refill the fluid supply and reprime the
pump.
Broken air motor compression spring. Replace the spring.
Pump slowly moves after fluid shutoff
in downstroke.
Clogged or dirty intake valve check
ball.
Clean ball and seat.
Worn or damaged valves or seats. Install repair kit.
Pump slowly moves after fluid shutoff
in upstroke.
Clogged or dirty lower piston ball or
seat.
Clean ball and seat.
Worn or damaged valves or seats. Install repair kit.